Eutychianism

This is similar to Monophycitism. It states that Christ's natures were so thoroughly combined -- in a sense scrambled together -- that the result was that Christ was not really truly able to relate to us as humans. The problem is this implies that Jesus was not truly God nor man. Therefore, He would be unable to act as mediator and unable to truly atone for our sins. (See Hypostatic Union, which is the correct view of Christ's two natures, and also Nestorianism and Monophycitism which are the incorrect views of Christ's two natures.)